DSH 384 Lithium Cell Protection

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DSH 384 7 t2 @' M" s9 M5 h* P( O

Lithium Cell Protection ; z, V( d/ p& i4 V  m

4.3.21

60950(ed.2)

Standard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
( |$ J8 O' |% B4 h: `% h- ]Page 1(1)
& S8 L" Z9 M' B: K1 oSubject: Lithium Cell Protection Key words:
-Lithium Cell
2 |+ m) g: O& g5 }- K% K( a-Clearances
- failure mode
5 r' G7 L0 ~- N0 h' @# [" pProvisional Decision taken by ETF2
6 V* p& F9 ?/ k) K& p# \and to be approved by CTL at its
38th meeting, in Toronto
, a) v9 f4 L6 C# BQuestion:
$ v: v9 b7 I; |: Q; C! H% g3 ^2 EClause 4.3.21 requires that two levels of protection are required to prevent forced or reversed charge
, g2 I4 |7 F7 N4 @7 U7 Cor forced discharge if this would result in a hazard. Conventionally a combination of resistor, diode
  ]5 ?7 r5 ]! xor ic has been considered suitable and is for the series current path. However, a new consideration
# L6 K2 d. b; w7 Dhas been raised in respect of adjacent tracks, separated by no more than operational insulation, which,
under s/c conditions will bypass the protective series components and provide charging current for
either chargeable or non-rechargeable batteries. Does this mean that there is therefore a requirement
for Reinforced separation?
- X1 ~8 o/ R% Y0 T" L$ V( ?If that is the case, then the controlling factor is the clearance of 0.8mm in Table 5 (circuits not subject
to transient over voltage). This is based on the fact that creepage cannot be less than clearance and
5 T* a2 B0 H* w$ S( R) ?creepage can be calculated to be, for example at +5V, 0.4mm (based on rounding up 0.12mm to
0.2mm for Basic and doubling for reinforced.
Decision:
Operational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
1 T4 u8 t& Y: `7 Q, J2 P(see 1.2.9.1)
- I. m) Q1 n. G( h/ aCare should be taken by determining clearance and creepage distances which column of the table has
to be used.(Transients have to be taken into account)

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